add in-package

serious business
marginally better style

trying out lisp-critic, I don't hate _all_ the advice
clean up cruft

very slightly less bad
minor updates

mostly style related
move coverage remark out

(it's in the readme)
add test function and data
rename file for clarity
fix a single apostrophe bug
fix step-1a

fewer failures
bug fixes

remove extraneous stuff
add port

it probably kind of works